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externals/ffmpeg/compat/w32pthreads.h

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+/*
+ * Copyright (C) 2010-2011 x264 project
+ *
+ * Authors: Steven Walters <kemuri9@gmail.com>
+ *          Pegasys Inc. <http://www.pegasys-inc.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * w32threads to pthreads wrapper
+ */
+
+#ifndef COMPAT_W32PTHREADS_H
+#define COMPAT_W32PTHREADS_H
+
+/* Build up a pthread-like API using underlying Windows API. Have only static
+ * methods so as to not conflict with a potentially linked in pthread-win32
+ * library.
+ * As most functions here are used without checking return values,
+ * only implement return values as necessary. */
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <process.h>
+#include <time.h>
+
+#include "libavutil/attributes.h"
+#include "libavutil/common.h"
+#include "libavutil/internal.h"
+#include "libavutil/mem.h"
+#include "libavutil/time.h"
+
+typedef struct pthread_t {
+    void *handle;
+    void *(*func)(void* arg);
+    void *arg;
+    void *ret;
+} pthread_t;
+
+/* use light weight mutex/condition variable API for Windows Vista and later */
+typedef SRWLOCK pthread_mutex_t;
+typedef CONDITION_VARIABLE pthread_cond_t;
+
+#define PTHREAD_MUTEX_INITIALIZER SRWLOCK_INIT
+#define PTHREAD_COND_INITIALIZER CONDITION_VARIABLE_INIT
+
+#define InitializeCriticalSection(x) InitializeCriticalSectionEx(x, 0, 0)
+#define WaitForSingleObject(a, b) WaitForSingleObjectEx(a, b, FALSE)
+
+#define PTHREAD_CANCEL_ENABLE 1
+#define PTHREAD_CANCEL_DISABLE 0
+
+static av_unused unsigned __stdcall attribute_align_arg win32thread_worker(void *arg)
+{
+    pthread_t *h = (pthread_t*)arg;
+    h->ret = h->func(h->arg);
+    return 0;
+}
+
+static av_unused int pthread_create(pthread_t *thread, const void *unused_attr,
+                                    void *(*start_routine)(void*), void *arg)
+{
+    thread->func   = start_routine;
+    thread->arg    = arg;
+#if HAVE_WINRT
+    thread->handle = (void*)CreateThread(NULL, 0, win32thread_worker, thread,
+                                           0, NULL);
+#else
+    thread->handle = (void*)_beginthreadex(NULL, 0, win32thread_worker, thread,
+                                           0, NULL);
+#endif
+    return !thread->handle;
+}
+
+static av_unused int pthread_join(pthread_t thread, void **value_ptr)
+{
+    DWORD ret = WaitForSingleObject(thread.handle, INFINITE);
+    if (ret != WAIT_OBJECT_0) {
+        if (ret == WAIT_ABANDONED)
+            return EINVAL;
+        else
+            return EDEADLK;
+    }
+    if (value_ptr)
+        *value_ptr = thread.ret;
+    CloseHandle(thread.handle);
+    return 0;
+}
+
+static inline int pthread_mutex_init(pthread_mutex_t *m, void* attr)
+{
+    InitializeSRWLock(m);
+    return 0;
+}
+static inline int pthread_mutex_destroy(pthread_mutex_t *m)
+{
+    /* Unlocked SWR locks use no resources */
+    return 0;
+}
+static inline int pthread_mutex_lock(pthread_mutex_t *m)
+{
+    AcquireSRWLockExclusive(m);
+    return 0;
+}
+static inline int pthread_mutex_unlock(pthread_mutex_t *m)
+{
+    ReleaseSRWLockExclusive(m);
+    return 0;
+}
+
+typedef INIT_ONCE pthread_once_t;
+#define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT
+
+static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
+{
+    BOOL pending = FALSE;
+    InitOnceBeginInitialize(once_control, 0, &pending, NULL);
+    if (pending)
+        init_routine();
+    InitOnceComplete(once_control, 0, NULL);
+    return 0;
+}
+
+static inline int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
+{
+    InitializeConditionVariable(cond);
+    return 0;
+}
+
+/* native condition variables do not destroy */
+static inline int pthread_cond_destroy(pthread_cond_t *cond)
+{
+    return 0;
+}
+
+static inline int pthread_cond_broadcast(pthread_cond_t *cond)
+{
+    WakeAllConditionVariable(cond);
+    return 0;
+}
+
+static inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
+{
+    SleepConditionVariableSRW(cond, mutex, INFINITE, 0);
+    return 0;
+}
+
+static inline int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
+                                         const struct timespec *abstime)
+{
+    int64_t abs_milli = abstime->tv_sec * 1000LL + abstime->tv_nsec / 1000000;
+    DWORD t = av_clip64(abs_milli - av_gettime() / 1000, 0, UINT32_MAX);
+
+    if (!SleepConditionVariableSRW(cond, mutex, t, 0)) {
+        DWORD err = GetLastError();
+        if (err == ERROR_TIMEOUT)
+            return ETIMEDOUT;
+        else
+            return EINVAL;
+    }
+    return 0;
+}
+
+static inline int pthread_cond_signal(pthread_cond_t *cond)
+{
+    WakeConditionVariable(cond);
+    return 0;
+}
+
+static inline int pthread_setcancelstate(int state, int *oldstate)
+{
+    return 0;
+}
+
+#endif /* COMPAT_W32PTHREADS_H */